Fires when user leaves the server.
The Disconnected Event syntax has these parts:
||A wodFTPD object.
||A FtpUser object. Reference
to user who is leaving the server.
This event is fired when user sends QUIT command and is
about to be disconnected from the server. At this point, he
is already removed from Users collection, but
still you have one last chance to access information stored
in his instance of User object.